PM urges vigilance over cyber attack

Prime Minister Malcolm Turnbull insists the government is closely monitoring the Australian impact of the latest cyber attack sweeping the world.

Production at Cadbury's famous chocolate factory in Hobart has ground to a halt after its parent company was engulfed in the latest cyber attack sweeping the world.

Transport giant TNT and international legal firm DLA Piper, both of which have offices across Australia, are among those struggling to get their computers working again after they were frozen by the Petya virus.

Mr Turnbull urged businesses and households that suspect they've been hit to contact the Australian Cyber Security Centre.

"This attack does appear very similar to the WannaCry ransomware attack," he told reporters in Cooma NSW.